There are tools which helps user to identify which is dofollow and which is nofollow link like ahref or we can just check the html link code if there is nofollow then the link is nofollow and in default way the link is always dofollow.

There are so many tools to check your website back-links, there only you can get the information about particular backlink whether it is do-follow or no-follow.
The following are the free back-links checking tools :
Ranksignals.com
SEMRush
SEO SpyGlass

There are many tools available online to find do links for your website. You can use these tools and find out back-links of your competitors and it is useful for your site too.
Tools are:
Ranksignals.com
SEMRush
Backlinkwatch

1) Analyse your competitors top performing contents. Know their backlink sources using tools like Ahrefs or SE Ranking. Create content that is better than your competitors content.
Reach out to the list of sites that you got from backlink analysis tools.
2) Find some bloggers doing round-up posts. And reach out to them to add your content in their round-ups.
3) Do guest posts on niche related sites

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